Chuck



1933- E. A. NORMAND 1,921,694

CHUCK Filed May 10, 1932 HA5 ATTORNEY '10 broken twist drill;

PatentedAug-s,

i 7 UNITED S A E AT NT FFIC j CHUCK, Ernest A. Normand, San Francisco, Calif;

assignor to Emile H. Normand, San Francisco, Calif.-

1 Application Mayra, 193,2. Serial 110,610,478

1 Claim. rel. 279-93) My invention relates to a chuck, and par ball relative to its'distance from the center'of ticularly to a chuck for gripping a fluted tool. the recess so that the ball may be forced against 1 It is among the objects of my invention to the tool shank to prevent the tool from dropping j provide a chuck having locking means for enout offthe chuck. By this construction a tool 7 gaging a flute in the tool, so that a squared or having merely a fluted shank to be, engaged other special shank end on the tool isunneces- With,'such as a broken twist drill, may be se-. saw in the operation of the chuck." curely held; .Means are also preferably provided Another object of my invention is to provide in the chuck for selectively varying the length of ,a chuck for holding brokentools, such as a tool projecting from the chuck. l

' i In greater'detail, and referring particularly to 5* Another object of my invention is to provide Figures 1. and 3, the preferred form of chuck a chuck in which the length of tool projecting embodying my invention comprises aholder hav- 1 from the chuck may be selectively varied. ing a shank portion 2 and an enlarged 'head A further object of my invention includes the portion 3; the latter b essed towrec'ei ve provision, in h k of the character described, the fluted end of a tool, such as the twist drill 4. 6} of means for preventing the tool from dropping The base of the tool receiving recess 6 terminates out of the ch k, V in the head 3 and provides a seatagainst which The invention possesses otherobjects and fea the b End the 70001 i is adapted to b a -v tures of advantage, some of which, with the T Chuck head, is p e ably S drilled to foregoing, will be set forth in the following p v p i f oppositely disposed p r res 'I 75' description of my invention. It is to beunder- 133 5 into therecess A k n lemen 0 stood that I do not limit myself to this disball 8 isjseated in each offthe apertures '7, and closure of species of my invention, as I may pro e i t h re s f a in a flut 9 in adopt variant embodiments thereof within the the t001- These balls preferably v -a d a scope f the claim. 4 'ter greater than half the Width of. the recess 6, 6 Referring mu drawing: and are arranged so that each prevents the Figure 1 is a side view, partly in section and Other from'dloppingmlt 0f the aperture in WhiGh partly in elevation, showing the preferred form it is i u of chuck embodying my invention; and Means are also preferablyprovided for adjust- Figure 2 is Chuck having a gripping ing the locking elements or balls 8 relative to 5 smilar to that shown in Figure l, but having a v e 'amou nt-of theirlsep 50 that th balls variant form of shank construction. may be forced a s the tool 4 t0, p eV n the' Figure 3 is a transverse vertical sectional view 11001 dropping/Out 0f the Chuckr this of the head taken in a plane indicated by the purpose the chuck d 3 is p e ably tapered,

1 3 of Figure V and a sleeve 11, having a tapered surface com- 96 Figure 4 is a different t of chuck o plementary to the tapered head, is threaded on 1 ing t improvements of my invent-ion; and l the head. This construction is best shown in Figure 5 shows a half portion of t Same Figure l, and it will benoted that thesleeve 11 Figure 6 is an and View Shcwing head covers the apertures 7 and the tapered surface M struction of thev chuck illustrated in Figure f Pre es a backmg against which the 95 Figure 7 is another variant form of chuck embans 3 are, adapted to r- By turning the bodying my invention; an sleeve 11. in one direction the locking balls are Figure 3 is an end View of u sanm forced together to clamp against the tool 4, and Figure 9 shows one of the blanks used in makin h sleeve h'a Opposite direction ing th chuck n t t in Figure 7 the balls are allowed to separate to permit ready Figure 10 isanother form of chuck differing i of the slightly from the construction shown in Figure '7. A variant form of the preferred C uck con In terms of b d inclusion, t chuck structicn is shown in Figure 2, wherein it will 3 5 .bodying my invention comprises arec'essed holdbe noted that the IECBSS 12 fOl receiving the i001 er for receiving the shank of a flutedtool, and extendsfintil'eiy through 51-11 s d hank p01- 5 a locking element mounted on the holder and tion 13 of the holder. The shank end of the projecting into the recess forengaging a flute holder is slotted, and is threaded to receive a in the tool. The locking element is preferably plug 14. By this arrangement it will beunderr in the nature of'a ball seated'in the holder, and stood that the-depth of the recess 12 may he means are preferably provided for adjusting thepvaried by turning the'adjusting plug 14. Thus",

means are provided for varying the length of tool portion projecting from the chuck. This construction is particularly useful in turret machine wcrk, where it. is often desirable to vary" the length of the projecting drill portion. When the holder is clamped into the machine head 16 the plug 1% is securely locked in the slotted shank portion 13.

A variant form of chuck construction embodying my invention is shown in Figures 4 to 6, and comprises a split holder having similarly formed half portions 17. A tool receiving recess is provided in the holder, and is formed by a recess 18 formed in the head portion 19 of, each holder portion.

The locking elements in this case are fixed to he holder, and are preferably formed by lugs 22 on the holder portions. It is to be noted that the holder is split through the locking elements; note Figure 6. This permits theheads to engagethe sides of the tool and hold the same firmly'in the chuck. When the holder is formed by forging, as may conveniently be done, the I lugs 22 may readily be formed by hammering down lumps of metal provided in the flat surfaces of the heads 19. A groove 23 is preferably provided about the head 19, so that a spring 24 may be inserted to hold the split holder portions in assembled relation.

Still another variant form of chuck embodying other, and then twisting the blanks. portion 2'7 of the blanks forms the base of the my invention is shown in Figures 7 to 9. In this case the holder is built up of a plurality of interfitting helical strips 25,each having a locking flange 26 formed thereon for engaging the flute of the tool. One of the blanks from which the holder is. made is shown in Figure 9. The chuck shown in Figure '7 is made by placing two blanks similar to that shown in Figure 9 together with the flanges 26 opposing one an- The butt ing portions projecting into the recess for en- 0 gaging flutes in said tool, said holder being split longitudinally thereof and through theflute engaging portions.

ERNEST A. NORMAND. 

